Windows Server 2008 R2 IIS下载文件，通过URL直接访问文件地址，可以成功下载，通过流方式下载，提示网络错误（如下图），但是部署我本地Windows 10 IIS，可以通过流方式正常下载。哪位大神可告知！

流方式下载代码，如下：

 byte[] buffer = new byte[102400L];
 HttpContext.Current.Response.Clear();
 FileStream fileStream = File.OpenRead(fileInfo.FullName);
 long num = fileStream.Length;
 HttpContext.Current.Response.ContentType = "application/octet-stream";
 HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" 
 + HttpUtility.UrlEncode(savename, Encoding.UTF8));
 HttpContext.Current.Response.AddHeader("Content-Length", fileInfo.Length.ToString());
 while (num > 0L && HttpContext.Current.Response.IsClientConnected)
 {
          int num2 = fileStream.Read(buffer, 0, Convert.ToInt32(102400L));
          HttpContext.Current.Response.OutputStream.Write(buffer, 0, num2);
          HttpContext.Current.Response.Flush();
          num -= (long)num2;
  }
  HttpContext.Current.Response.Close();
  fileStream.Close();
  fileStream.Dispose();